Commit ab6088e7 authored by Nathan Chancellor's avatar Nathan Chancellor Committed by Peter Zijlstra
Browse files

lib/Kconfig.debug: Require a release version of LLVM 22 for context analysis 



Using a prerelease version as a minimum supported version for
CONFIG_WARN_CONTEXT_ANALYSIS was reasonable to do while LLVM 22 was the
development version so that people could immediately build from main and
start testing and validating this in their own code. However, it can be
problematic when using prerelease versions of LLVM 22, such as Android
clang 22.0.1 (the current android mainline compiler) or when bisecting
LLVM between llvmorg-22-init and llvmorg-23-init, to build the kernel,
as all compiler fixes for the context analysis may not be present,
potentially resulting in warnings that can easily turn into errors.

Now that LLVM 22 is released as 22.1.0, upgrade the check to require at
least this version to ensure that a user's toolchain actually has all
the changes needed for a smooth experience with context analysis.

Fixes: 3269701c ("compiler-context-analysis: Add infrastructure for Context Analysis with Clang")
Signed-off-by: default avatarNathan Chancellor <nathan@kernel.org>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: default avatarMarco Elver <elver@google.com>
Link: https://patch.msgid.link/20260224-bump-clang-ver-context-analysis-v1-1-16cc7a90a040@kernel.org
parent 6de23f81

lib/Kconfig.debug

+2 −2
Original line number Diff line number Diff line
@@ -630,7 +630,7 @@ config DEBUG_FORCE_WEAK_PER_CPU 


config WARN_CONTEXT_ANALYSIS

	bool "Compiler context-analysis warnings"

	depends on CC_IS_CLANG && CLANG_VERSION >= 220000

	depends on CC_IS_CLANG && CLANG_VERSION >= 220100

	# Branch profiling re-defines "if", which messes with the compiler's

	# ability to analyze __cond_acquires(..), resulting in false positives.

	depends on !TRACE_BRANCH_PROFILING
@@ -641,7 +641,7 @@ config WARN_CONTEXT_ANALYSIS 
	  and releasing user-definable "context locks".



	  Clang's name of the feature is "Thread Safety Analysis". Requires

	  Clang 22 or later.

	  Clang 22.1.0 or later.



	  Produces warnings by default. Select CONFIG_WERROR if you wish to

	  turn these warnings into errors.